Type of Reactions: Redox reaction

Question 1

Depends on the pH

(MnO4)- in acidic medium

Also tell its colour

Answer 1

Mn+2 (Colourless)

(MnO4)- = purple

Question 2

Depends on the pH

(MnO4)- in basic medium

Also tell its colour

Answer 2

MnO2 (Brown)

(MnO4)- = purple

Question 3

Depends on the pH

(MnO4)- in neutral medium

Also tell its colour

Answer 3

(MnO4)2- (Green)
Stable only in basic medium

(MnO4)- = purple

Question 4

Depends on the pH

(MnO4)2- in acidic or neutral medium

Also tell its colour

Answer 4

(MnO4)- + MnO2
(Disproportionation reaction)

(MnO4)2- = green, stable only in a basic medium

Question 5

Depends on the pH

(CrO4)2- in acidic medium

Also tell its colour

Answer 5

(Cr2O7)2- (orange)

(CrO4)2- = yellow

Question 6

Depends on the pH

(Cr2O7)2- in basic medium

Also tell its colour

Answer 6

(CrO4)2- (yellow)

(Cr2O7)2- = orange

Question 7

Depends on temperature

Down the reactivity series, more/less temperature is needed to be oxidised and why?

Answer 7

More temperature is needed as Oxidation Potential decreases

Question 8

Depends on temperature

M + H2O

Answer 8

MOH + H

Question 9

Depends on temperature

M + Steam

Answer 9

MO + H

Question 10

Depends on concentration

Metal above H in reactivity series + N.O.A

N.O.A. = Non oxidising acid

Answer 10

Salt + H

Question 11

Depends on concentration

Metal below H in reactivity series + N.O.A

N.O.A. = Non oxidising acid

Answer 11

No reaction

Question 12

Depends on concentration

M above Pb in reactivity series + conc HNO3

also conc means what %

Answer 12

M(NO3)x + NO2

70%

Question 13

Depends on concentration

M above Pb in reactivity series + dil HNO3

also dil means what %

Answer 13

M(NO3)x + N2O

20%

Question 13

Depends on concentration

M above Pb in reactivity series + very dil HNO3

also very dil means what %

Answer 13

M(NO3)x + NH3
NH3 + HNO3 -> NH4NO3

6%

Question 14

Depends on concentration

M below Pb in reactivity series + very dil HNO3

also very dil means what %

Answer 14

No reaction

6%

Question 15

Depends on concentration

M below Pb in reactivity series + conc HNO3

also conc means what %

Answer 15

M(NO3)x + NO2

70%

Question 16

Depends on concentration

M below Pb in reactivity series + dil HNO3

also dil means what %

Answer 16

M(NO3)x + NO

20%

Question 16

Depends on concentration

Amphoteric metal + Base

Answer 16

Salt + H

Question 17

Depends on concentration

For which M does very dil HNO3 act as reducing agent

Answer 17

M = Mg/Mn
2% HNO3
M + HNO3 -> M(NO3)2 + H

Question 17

Depends on concentration

Non metal + N.O.A.

Answer 17

No reaction

Question 17

Depends on concentration

Non metal + O.A.

Answer 17

ic oxy acid
B -> H3BO3
Si -> H4SiO4
P -> H3PO4
S -> H2SO4
C -> H2CO3 -> H2O + CO2
I -> HIO3

Question 17

Depends on concentration

Noble metal + aqua regia

What is aqua regia? Which noble metal is insoluble in aqua regia?

Answer 17

Noble metal (soluble) = Au, Hg, Pt
Aqua regia = HNO3 + 3HCl

Insoluble = Ag

Question 17

Depends on concentration

M + 80% HNO3 -> layer of MO

M can be = ?

Answer 17

Al, Cr, Fe, Co, Ni, Be

All criminal free colcata nikal bhage

Question 17

Depends on concentration

Non metal + Base

Answer 17

Disproportion reaction

Question 17

O.A. examples

Answer 17

conc. H2SO4
dil. HNO3
conc. HNO3

Question 18

N.O.A examples

Answer 18

dil. HCl
conc. HCl
dil. H2SO4